wd31
FCP = Fluorescent coated paper PVAD = Polyvinyl alcohol acetate dextrin gum
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WD31 - Wales 10.5p greyish blue, FCP/PVAD, two 4.75mm B3 phosphor bands (Cyl 3) (Harrison/photo) - Deegam W105.1.1 - S.G specialised XW41 - Stoneham WA40 - Concise W30

Two 4.75mm B3 phosphor bands from cylinder 3 [18.1.78]